First off, I’ve come across two different sets of values for the same Columbus tube HYP114OV450MTB, and I’m not sure which one is correct. I’m attaching screenshots of both versions. Has anyone worked with this tube and can confirm the right spec?
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I’m attaching screens, im not sure which one is correct.
Second, I’m struggling to understand the relationship between oval dimensions and outer diameter (OD) in the parameters.
From what I see:
OD is listed as 24 mm
Oval section is 18 × 30 mm
Dropout end is 16 mm
If I were to recreate this in CAD, my current thinking would be:
Start with an oval profile (18 × 30)
Sweep it along the first section (up to 150 mm)
Then loft it down to Ø16 mm toward the dropout
Where does the 24 mm OD come from I’d say the OD would be 30 because it’s the largest, idk, please correct me.
(I’m working on yoke and dropout design so would like to recreate the tube to reference it)
Regarding the bend profile, it may be that Columbus either offers two bend profiles for the same oval tube (but then the tube SKU should be unique for each profile), or the more likely scenario is that at least one of the two specs/illustrations is incorrect.
I’d reach out to Columbus directly. They’ve been helpful to me in the past.
I don’t know why they don’t have a current Hyperion Ti tube catalogue on the website.
As Carl says, 24mm represents the round base tube. The circumference of a 24OD tube and one with a 30x18 shape is rougly the same.
An oval shape, or ellipse, is specified by both the major (larger) and minor (smaller) axis, not just one number as that would indicate that it’s a round tube.
